Scheduling meetings can be a nearly insurmountable task. Finding a time that works for everyone in the same organisation, let alone across different time zones, can feel like trying to solve a puzzle with a missing piece.
There are several web applications that can help you send around a poll to find out what times work for each participant, with several different options for dates and times provided. By taking the intersection of all the good times, you can uncover the ideal meeting schedule.
Should you want to host your own meeting poll software, there are several open source options available to you, and the linked article covers five of those. Not all have to be self-hosted as the very first option is a free cloud hosted solution, which can be optionally self-hosted too.
See 5 open source alternatives to Doodle polls
Whether you run a temporary solution in a container, an occasional poll on Nextcloud, or build a full productivity suite around scheduling, there are plenty of open source solutions for getting input from your event's participants.